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# Problem3 The gas-phase reaction 4A→ 3B + 2C occurs via the following sequence of elementary steps. Y and Z are reactive intermediates. a) Obtain an expression for the reaction rate, r, in terms of the reaction rate for step 3, r3. Note that the elementary steps written may need to occur multiple times to give the overall reaction stoichiometry b) Using your answer from part A, obtain an expression for the reaction rate, r,in terms of rate constants and concentrations of reactants and products assuming only PSSH on the intermediates. c) Experimentally, at some conditions, the reaction rate exhibits the following dependence on the concentration of A and B (A)2 What approximations are required in the rate expression obtained in part B in order to explain the concentration dependence on this rate? d) For the general case, simplify the rate expression obtained in part IB assuming that: (i) Step 1 is irreversible ii) Step 1 is quasi-equilibrated

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